Why I am seeing private symbols in MDK Library Output

Hello All, 

Due to security concerns, we need to close some part of our implementation so we have different uVision library projects includes concerned implementation. But when we look into MDK (ARMCC) library output file we are seeing even our private symbols (e.g. private/static function names). 

So, from the reverse engineering side,  can symbol names be used to understand how it works? Or can we  reduce information in a library output using compiler/linker flags?

Regards.